CN105503270B - A kind of preparation method of SiC coatings - Google Patents
A kind of preparation method of SiC coatings Download PDFInfo
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- CN105503270B CN105503270B CN201510956009.4A CN201510956009A CN105503270B CN 105503270 B CN105503270 B CN 105503270B CN 201510956009 A CN201510956009 A CN 201510956009A CN 105503270 B CN105503270 B CN 105503270B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5053—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials non-oxide ceramics
- C04B41/5057—Carbides
- C04B41/5059—Silicon carbide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/87—Ceramics
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/60—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which all the silicon atoms are connected by linkages other than oxygen atoms
Abstract
The present invention relates to a kind of preparation methods of SiC coatings；More particularly to a kind of method that coat of silicon carbide is prepared by CVI techniques and PIP techniques.The crystal vessel a for filling polymethyl silicane is placed in crystal vessel b by the present invention; then drying, clean workpiece to be coated are placed in crystal vessel b; it vacuumizes, be passed through protective gas; then the air pressure in crystal vessel b is evacuated to again less than or equal to after 100Pa; close air inlet; after being warming up to 700~1000 DEG C, preferably 700~800 DEG C; after heat preservation obtains the workpiece with indefinite form coat of silicon carbide; it is sintered under vacuum atmosphere or protective atmosphere in 1500~1600 DEG C, obtains the workpiece with beta silicon carbide coating.Gained coating quality of the invention is good, short preparation period, preparation process are simple, convenient for commercial application.
Description
Technical field
The present invention relates to a kind of preparation methods of SiC coatings；It is more particularly to a kind of to be prepared by CVI techniques and PIP techniques
The method of coat of silicon carbide.
Background technology
With the progress of modern science and technology, industrial production proposes structural material more and more requirements, such as requires
Material has the performances such as high temperature oxidation resisting, corrosion-resistant, anti-vibration, antifatigue, the resisting temperature sudden turn of events and resistance to erosion.
Carborundum is the extremely strong compound of covalent bond, and covalent bond ingredient accounts for 88%, and still keeps high key at high temperature
Close intensity.This design feature of carborundum determines a series of his excellent performances, high intensity, high rigidity, high temperature resistant, antioxygen
Change, high heat conductance, low thermal expansion rate, excellent chemical stability and the performance do not corroded by most acid-base solution.
Thyrite also has excellent high-temperature oxidation resistant characteristic.The protective film of Surface Creation densification during high-temperature oxydation inhibits
The further oxidation of oxygen, therefore with excellent antioxygenic property.
At present, the preparation method of SiC coatings mainly has Si-C in-situ reactions, chemical vapour deposition technique etc..Si-C is in situ
Reaction method is usually at 1500~1700 DEG C, is contacted using the mobility and steam silicon of liquid silicon with carbon, reaction generation carborundum, this
Though it is easy to operate, at low cost that method prepares coat of silicon carbide, thickness evenness control difficulty is larger, and with the presence of remaining silicon,
Influence coating corrosion resistant and high-temperature oxidation resistance etc..At present, vapour deposition process prepares coat of silicon carbide mainly using three chloromethanes
Base silane is that raw material, hydrogen or argon gas are carrier gas, at 1100 DEG C or so, the deposition of hundreds of hours, can be finally tightly combined,
The coat of silicon carbide haveing excellent performance.But it can be generated since trichloromethyl silane has in corrosivity and inflammable and explosive, deposition process
A large amount of HCl gases and depositing temperature is at 1100 DEG C or so, it is stringent to equipment and environmental requirement, and fabrication cycle is long, of high cost.
Patent CN 1994974A report one kind using Polycarbosilane as raw material, and cracking at high temperature forms coat of silicon carbide.
Polycarbosilane preparation process in the patent is complicated, need to pass through the condensation of dimethyl monomer sodium, PDMS is refined, high temperature pyrolysis waited
Journey, and need first to have brought 10~80% Polycarbosilane solution into 30% hole using vacuum-high-pressure impregnation technique in coating procedure
Higher to matrix selectivity in the matrix of gap, higher to equipment requirement, post-processing temperature is also higher, at 900~1500 DEG C.
It has with the volatilization of gas and carborundum volume contraction due to being cracked at high temperature in Polycarbosilane, is given birth in hole inner wall
Into coat of silicon carbide have crackle and generate, need multiple dipping-high-pressure impregnation, high-temperature process can just obtain combining uniform carbonization
Silicon coating.
Patent CN 104264455A report a kind of by-product carbon silane in preparation process using Polycarbosilane 800
~900 DEG C of methods for preparing coat of silicon carbide.Raw material is by-product of the polydimethylsiloxane at 400~600 DEG C in the patent,
It is complicated for operation, and yield is relatively low, and carbon silane prepares and is needed in coat of silicon carbide using hydrogen to be diluent gas.
The content of the invention
The defects of to overcome the above-mentioned prior art, the present invention provide a kind of raw material and prepare simple, nontoxic, equipment requirement letter
List, production is pollution-free, preparation temperature is low, fabrication cycle is short, low-cost production's method of efficient coat of silicon carbide.
A kind of preparation method of SiC coatings of the present invention, comprises the following steps：
Step 1
The crystal vessel a for filling polymethyl silicane is placed in crystal vessel b, it then will dry, clean workpiece to be coated
It is placed in crystal vessel b, vacuumizes, is passed through protective gas, the air pressure being then evacuated to again in crystal vessel b is less than or equal to
After 100Pa, air inlet is closed, after being warming up to 700~1000 DEG C, preferably 700~800 DEG C, heat preservation is obtained with indefinite form carbon
The workpiece of SiClx coating；In the workpiece with indefinite form coat of silicon carbide, the thickness of indefinite form coat of silicon carbide is more than etc.
In 5 microns；
Step 2
The workpiece of indefinite form coat of silicon carbide will be carried obtained by step 1；It is placed in sintering furnace, in vacuum atmosphere or protection
It is sintered under atmosphere, obtains the workpiece with beta silicon carbide coating；The temperature of the sintering is 1500~1600 DEG C.
The volume ratio of a kind of preparation method of SiC coatings of the present invention, crystal vessel a and crystal vessel b are 1：3~10, stone
Ink container a is opening, and crystal vessel b is inlet, sealable container.
A kind of preparation method of SiC coatings of the present invention in step 1, when being warming up to 700~1000 DEG C, controls heating rate
It is preferably 15~20 DEG C/min for 10~30 DEG C/min.
In order to improve the quality of product coating, a kind of preparation method of SiC coatings of the present invention, the step 1 includes following
Operation：
Step 1 a
By 1m3Crystal vessel a dress 10-20kg polymethyl silicanes ratio with taking polymethyl silicane；It then will be with taking
Polymethyl silicane is contained into crystal vessel a, and the crystal vessel a for filling polymethyl silicane is placed in crystal vessel b, then will be dry
Dry, clean workpiece to be coated is placed in crystal vessel b, is vacuumized, is passed through protective gas, is then evacuated to crystal vessel b again
In air pressure be less than or equal to 100Pa after, close air inlet, be warming up to 700~1000 DEG C, be preferably 700~800 DEG C, heat preservation
After when 0.5-1.5 is small, less than 100 DEG C are cooled to the rate of temperature fall of 3-5 DEG C/min, is obtained with first layer indefinite form carborundum
The workpiece of coating；
Step 1 b
Using the workpiece for carrying i-th layer of indefinite form coat of silicon carbide as workpiece to be coated, the operation of step 1 a is repeated, obtains band
There is the workpiece of i+1 layer indefinite form coat of silicon carbide；It is further continued for repeating step 1 a until the thickness of all indefinite form coat of silicon carbide
The sum of degree is more than or equal to 5 microns；Preferably greater than it is equal to 10 microns；The i is more than or equal to 1.
A kind of preparation method of SiC coatings of the present invention in step 1 a, step 1 b, is dropped with the rate of temperature fall of 3-5 DEG C/min
Wen Shi opens air inlet and is passed through nitrogen in crystal vessel b, by the pressure control of crystal vessel b in 0.101-0.12MPa.
A kind of preparation method of SiC coatings of the present invention, the average quality of the polymethyl silicane is 800~900, viscosity is
0.02~0.03cps.
A kind of preparation method of SiC coatings of the present invention in the coat of silicon carbide preparation process, need not add in hydrogen work
For diluent gas.
A kind of preparation method of SiC coatings of the present invention, after workpiece to be coated is placed in crystal vessel b, not with the poly- methyl silicon of liquid
Alkane contacts.
A kind of preparation method of SiC coatings of the present invention, polymethyl silicane is prepared by following step：
Step A
Aluminium powder is added in sodium sand, under protective atmosphere, stirring obtains spare sodium sand；Al and Na in the spare sodium sand
Mass ratio is 1:12~1:15；The granularity of the aluminium powder is 30-50um, and the granularity of sodium sand is 0.5-10um；
Step B
By the molar ratio of Na and Si, Na:Si=2.5~1:2~1 with taking spare sodium sand and monomer；Under protective atmosphere, first
Sodium sand is fitted into reaction kettle, then adds in organic solvent；Stirring, after being warming up to 70-85 DEG C, points at least 2 times will be with the list taken
Body is instilled in reaction kettle, and stirring carries out back flow reaction；Liquid after being reacted；The monomer is dichloro methyl silane；It is described organic
One kind in alkane, aromatic hydrocarbon of solvent is preferably toluene；Organic solvent takes the ratio between volume of monomer as 6 with matching somebody with somebody:1~
8:1；
Step C
Under protective atmosphere, centrifugal treating is carried out to liquid after reaction obtained by step 2, centrifugation gained liquid is in protective atmosphere
It is lower to be handled through distillation, obtain polymethyl silicane.
In industrial applications, aluminium powder is added in sodium sand, under protective atmosphere, is stirred under room temperature, obtains spare sodium sand；
The speed of stirring is 100~130 revs/min.The sodium sand is prepared by following proposal：Sodium block is immersed in equipped with toluene
Reaction kettle in, in protective atmosphere, sodium block is heated to 97-98 DEG C, stirring, until the completely broken postcooling of sodium block is to room
Temperature；Obtain the sodium sand that granularity is 0.5~10um.
In step B, match somebody with somebody the monomer taken and divide in 3-6 addition reaction kettle, add in by the way of being added dropwise add in every time, drip
The speed added is 20-30mL/min；After being added dropwise to complete every time, dropwise addition next time is carried out after 120~180min of stirring again.
In step B, when carrying out back flow reaction, condensing agent used is silicone oil with low viscosity；The viscosity of the silicone oil is 10cps-
15cps；
The speed of the stirring is 100-130 revs/min.
During industrial applications, using absolute ethyl alcohol as detergent, workpiece to be coated is placed in detergent and uses ultrasonic wave
After cleaning 25~35 minutes, in 75-120 DEG C of dry 1-3h, dried, clean workpiece to be coated.
A kind of preparation method of SiC coatings of the present invention, in step 1, the protective gas is nitrogen.The nitrogen it is pure
Degree is more than or equal to 99.999%.
A kind of preparation method of SiC coatings of the present invention, in step 1, workpiece to be coated is selected from graphite product, carbon carbon composite wood
One kind in material products, carbon ceramic composite material product, happy composite product, ceramic is preferably graphite product, carbon carbon
Composite product, filament fiber, carbon ceramic composite material product.
A kind of preparation method of SiC coatings of the present invention, in step 2, the protective atmosphere is argon gas atmosphere.
In order to improve coating quality, in step 2, the workpiece of indefinite form coat of silicon carbide will be carried obtained by step 1；It is placed in
In sintering furnace, under an argon atmosphere, first with the heating rate of 8-12 DEG C/min rise to 1000 DEG C by room temperature, then with 3-5 DEG C/
The heating rate of min rises to 1500~1600 DEG C, keeps the temperature 2-3h, and furnace cooling obtains the workpiece with beta silicon carbide coating.
Compared with prior art, the advantage of the invention is that：
1st, at lower temperature, 700~800 DEG C, Direct Pyrolysis is passed through for the first time using polymethyl silicane as raw material in the present invention
Coat of silicon carbide is prepared on the product deposition of gasification to workpiece, the polymethyl silicane used in the technology is non-corrosive liquid,
Solvent dissolving is not required, and it is very low to equipment requirement.
2nd, in the present invention, gasified by adding in the quality of polymethyl silicane and the fixing fabric structure Direct Pyrolysis of crystal vessel b
Gas concentration afterwards is not required to add the diluent gas such as hydrogen, nitrogen or argon gas adjusting gas concentration, simplifies operation step
Suddenly, equipment requirement is also reduced.
2nd, the SiC coating purities prepared using this method are high, up to more than 99.999%, and can be very good control carbon
The uniformity and thickness of SiClx coating.
3rd, the cycle of SiC coatings is prepared using this method compared with conventional vapor deposition method, the cycle is shorter；Using this hair
10.73 microns of beta silicon carbide coat deposition time prepared by bright technology is only 2h or so.4th, the SiC prepared using this method is applied
Layer consistency be high and the process stabilizing, and fabrication cycle is extremely short, can effectively improve the high-temperature oxidation resistance of workpiece, wearability, anti-
Corrosive power, while the porosity of workpiece surface can also be effectively reduced.
5th, SiC coatings are prepared using this method, it is easy to operate, it need not will be input into after material gasification with carrier gas, also not
It needs to enter inside workpiece by vacuum-high-pressure impregnation, need to only place it in crystal vessel a, by cracking gasification, deposition,
Uniform, fine and close coat of silicon carbide can be obtained, this method prepares carborundum, simple to equipment requirement, and entire simple process
Fast, industrialization production is facilitated.
It 6th, can be in graphite product, carbon carbon composite product, carbon ceramic composite material product, happy multiple using this method
The surfaces such as laminate article, ceramic prepare coat of silicon carbide.
Description of the drawings
Carbon ceramic material with coat of silicon carbide of the attached drawing 1 prepared by embodiment 1.
Graphite material with coat of silicon carbide of the attached drawing 2 prepared by embodiment 2.
Carbon carbon composite with coat of silicon carbide of the attached drawing 3 prepared by embodiment 3.
The XRD diagram of carbon carbon composite coat of silicon carbide of the attached drawing 4 prepared by embodiment 3.
The coat of silicon carbide scanning electron microscope (SEM) photograph of carbon ceramic material of the attached drawing 5 prepared by embodiment 1.
It can be seen that having the carbon ceramic material, graphite material, carbon carbon composite table of coat of silicon carbide from Fig. 1, Fig. 2, Fig. 3
Face carries silver gray gloss, illustrates that heretofore described coat of silicon carbide technology can be applied to carbon ceramic material, graphite material, carbon
Carbon composite carries out coat of silicon carbide on its surface.
From Fig. 4 the XRD spectra of coat of silicon carbide can be seen that 2 θ=36.5 °, 60.1 °, 71.8 ° of diffraction maximums return respectively
Belong to (111), (220), (311) crystal face diffraction of β-SiC, show that coating is made of β-SiC crystallites, while without apparent in XRD
Impurity diffraction maximum, it was demonstrated that coating is purer SiC coatings.
For the SEM figures of coat of silicon carbide as can be seen that coating uniform is fine and close, thickness is 10.73 microns from Fig. 5.
Specific embodiment
In the embodiment of the present invention, polymethyl silicane is prepared by following step：
Step A
Aluminium powder is added in sodium sand, under protective atmosphere, stirring obtains spare sodium sand；Al and Na in the spare sodium sand
Mass ratio is 1:13；The granularity of the aluminium powder is 40-45um, and the granularity of sodium sand is 10um；
Step B
By the molar ratio of Na and Si, Na:Si=2:1 with taking spare sodium sand and monomer；Under protective atmosphere, first sodium sand is filled
Enter in reaction kettle, then add in toluene；Stirring, after being warming up to 78-80 DEG C, (drop will be instilled in reaction kettle with the monomer taken by dividing 3 times
The speed added is 25mL/min；After being added dropwise to complete every time, dropwise addition next time is carried out after stirring 120min again.) stirring, it carries out
Back flow reaction；Liquid after being reacted；The monomer is dichloro methyl silane；Toluene takes the ratio between volume of monomer as 6 with matching somebody with somebody:1；
When carrying out back flow reaction, condensing agent used is silicone oil with low viscosity；The viscosity of the silicone oil is 10cps-15cps；
Step C
Under protective atmosphere, centrifugal treating (centrifugal rotational speed 1000r/min) is carried out to liquid after reaction obtained by step 2,
Centrifugation gained liquid is handled under protective atmosphere through distillation, obtains polymethyl silicane.The average quality of the polymethyl silicane is
850th, viscosity is 0.02~0.03cps.
In the embodiment of the present invention, using absolute ethyl alcohol as detergent, workpiece to be coated is placed in detergent and uses ultrasonic cleaning
After 30 minutes, in 100 DEG C of dry 1.5h, dried, clean workpiece to be coated.
Embodiment 1
The material of dry, clean workpiece to be coated is carbon ceramic composite material；
Step 1
By 1m3Crystal vessel a dress 20kg polymethyl silicanes ratio with taking polymethyl silicane；Polymethyl silicane will be filled
Crystal vessel a be placed in crystal vessel b, drying, clean workpiece to be coated are then placed in crystal vessel b (workpiece to be coated
After being placed in crystal vessel b, do not contacted with liquid polymethyl silicane), it vacuumizes, being passed through nitrogen, (its purity is more than or equal to
99.999%), be then evacuated to the air pressure in crystal vessel b again less than or equal to after 100Pa, close air inlet, with 10 DEG C/
Min is warming up to 900 DEG C, when heat preservation 2 is small after, furnace cooling obtains the workpiece with indefinite form coat of silicon carbide；It is described to carry not
It shapes in the workpiece of coat of silicon carbide, the thickness of indefinite form coat of silicon carbide is 10.73 microns；
Step 2 will carry the workpiece of indefinite form coat of silicon carbide obtained by step 1；It is placed in sintering furnace, in argon gas atmosphere
Under, 1000 DEG C first are risen to by room temperature with the heating rate of 10 DEG C/min, then rises to 1500 DEG C with the heating rate of 4 DEG C/min,
2h is kept the temperature, furnace cooling obtains the workpiece with beta silicon carbide coating.
The thickness for detecting beta silicon carbide coating is 10.73 microns.Ablation 10h, mass loss be under 1300 DEG C of aerobic environments
0.3‰。
Comparative example 1,
Other conditions are consistent with embodiment 1, only drying, clean workpiece to be coated are placed in polymethyl silicane, institute
The performance of product is that beta silicon carbide coating layer thickness is 0 micron, under 1300 DEG C of aerobic environments ablation 10h, mass loss be
2.7%.
Embodiment 2
The material of dry, clean workpiece to be coated is graphite；
Step 1
Step 1 a
By 1m3Crystal vessel a dress 10kg polymethyl silicanes ratio with taking polymethyl silicane；It then will be with the poly- first taken
Base silane is contained into crystal vessel a, and the crystal vessel a for filling polymethyl silicane is placed in crystal vessel b, then will dry,
Clean workpiece to be coated is placed in crystal vessel b, is vacuumized, is passed through protective gas, is then evacuated to again in crystal vessel b
After air pressure is less than or equal to 100Pa, closes air inlet, be warming up to 700 DEG C, when heat preservation 1.5 is small after, with the rate of temperature fall of 3 DEG C/min
100 DEG C are cooled to, obtains the workpiece with first layer indefinite form coat of silicon carbide；In step 1, with the rate of temperature fall of 3 DEG C/min
During cooling, open air inlet and be passed through nitrogen in crystal vessel b, by the pressure control 0.101-0.11MPa of crystal vessel b；
Step 1 b
To carry the operation 3 times that the graphite product of indefinite form coat of silicon carbide repeats step 1 a, until indefinite form carborundum applies
Layer thickness is 30 microns；
Step 2
The workpiece of indefinite form coat of silicon carbide will be carried obtained by step 1；Be placed in sintering furnace, under an argon atmosphere, first with
The heating rate of 10 DEG C/min rises to 1000 DEG C by room temperature, then rises to 1500 DEG C with the heating rate of 4 DEG C/min, keeps the temperature 2h,
Furnace cooling obtains the workpiece with beta silicon carbide coating.
The thickness for detecting beta silicon carbide coating is 30 microns.Ablation 10h, mass loss be under 1300 DEG C of aerobic environments
0.19‰。
Embodiment 3
The material of dry, clean workpiece to be coated is carbon carbon composite；
Step 1
Step 1 a
By 1m3Crystal vessel a dress 15kg polymethyl silicanes ratio with taking polymethyl silicane；It then will be with the poly- first taken
Base silane is contained into crystal vessel a, and the crystal vessel a for filling polymethyl silicane is placed in crystal vessel b, then will dry,
Clean workpiece to be coated is placed in crystal vessel b, is vacuumized, is passed through protective gas, is then evacuated to again in crystal vessel b
After air pressure is less than or equal to 100Pa, closes air inlet, be warming up to 1000 DEG C, when heat preservation 1 is small after, dropped with the rate of temperature fall of 3 DEG C/min
Temperature obtains the workpiece with first layer indefinite form coat of silicon carbide to less than 100 DEG C；In step 1 a, with the cooling of 3 DEG C/min
When rate cools down, open air inlet and be passed through nitrogen in crystal vessel b, by the pressure control 0.105-0.12 of crystal vessel b
MPa；
Step 1 b
To carry the operation 3 times that the carbon carbon composite of indefinite form coat of silicon carbide repeats step 1 a, until indefinite form is carbonized
Silicon coating thickness is 40 microns；
Step 2
The workpiece of indefinite form coat of silicon carbide will be carried obtained by step 1；Be placed in sintering furnace, under an argon atmosphere, first with
The heating rate of 8 DEG C/min rises to 1000 DEG C by room temperature, then rises to 1600 DEG C with the heating rate of 5 DEG C/min, heat preservation
1.5h, furnace cooling obtain the workpiece with beta silicon carbide coating.
The thickness for detecting beta silicon carbide coating is 40 microns.Ablation 10h, mass loss be under 1300 DEG C of aerobic environments
0.12‰。
Embodiment 4
The material of dry, clean workpiece to be coated is carbon fiber braided part；
Step 1
By 1m3Crystal vessel a dress 20kg polymethyl silicanes ratio with taking polymethyl silicane；Polymethyl silicane will be filled
Crystal vessel a be placed in crystal vessel b, drying, clean workpiece to be coated are then placed in crystal vessel b (workpiece to be coated
After being placed in crystal vessel b, do not contacted with liquid polymethyl silicane.), it vacuumizes, be passed through nitrogen, be then evacuated to graphite appearance again
After air pressure in device b is less than or equal to 100Pa, close air inlet, 800 DEG C be warming up to 10 DEG C/min, when heat preservation 0.5 is small after, with 3
DEG C/rate of min is cooled to less than 100 DEG C, obtain the workpiece with indefinite form coat of silicon carbide；It is described to be carbonized with indefinite form
In the workpiece of silicon coating, the thickness of indefinite form coat of silicon carbide is 5 microns；
Step 2
The workpiece of indefinite form coat of silicon carbide will be carried obtained by step 1；Be placed in sintering furnace, under an argon atmosphere, first with
The heating rate of 10 DEG C/min rises to 1000 DEG C by room temperature, then rises to 1500 DEG C with the heating rate of 4 DEG C/min, keeps the temperature 2h,
Furnace cooling obtains the workpiece with beta silicon carbide coating.
The thickness for detecting beta silicon carbide coating is 5 microns.Ablation 10h, mass loss be under 1300 DEG C of aerobic environments
0.35‰。
Comparative example 2
With 104264455 A embodiments 2 of patent CN for comparative example 2, with presoma liquid low molecule carbon silane, at 950 DEG C
When deposit 30min prepare coat of silicon carbide thickness be 800nm.
Claims (9)
1. a kind of preparation method of SiC coatings, which is characterized in that comprise the following steps：
Step 1
The crystal vessel a for filling polymethyl silicane is placed in crystal vessel b, is then placed in drying, clean workpiece to be coated
It in crystal vessel b, vacuumizes, be passed through protective gas, the air pressure being then evacuated to again in crystal vessel b is less than or equal to 100Pa
Afterwards, air inlet is closed, after being warming up to 700~1000 DEG C, heat preservation obtains the workpiece with indefinite form coat of silicon carbide；It is described to carry
In the workpiece of indefinite form coat of silicon carbide, the thickness of indefinite form coat of silicon carbide is more than or equal to 5 microns；The crystal vessel a and
The volume ratio of crystal vessel b is 1：3~10, crystal vessel a are opening, and crystal vessel b is inlet, sealable container；
Step 2
The workpiece of indefinite form coat of silicon carbide will be carried obtained by step 1；It is placed in sintering furnace, in vacuum atmosphere or protective atmosphere
Lower sintering, obtains the workpiece with beta silicon carbide coating；The temperature of the sintering is 1500~1600 DEG C.
2. a kind of preparation method of SiC coatings according to claim 1, it is characterised in that：In step 1,700 are warming up to
At~1000 DEG C, it is 10~30 DEG C/min to control heating rate.
3. a kind of preparation method of SiC coatings according to claim 1, it is characterised in that：The step 1 includes following
Operation：
Step 1 a
By 1m3Crystal vessel a dress 10-20kg polymethyl silicanes ratio with taking polymethyl silicane；It then will be with the poly- methyl taken
Silane is contained into crystal vessel a, and the crystal vessel a for filling polymethyl silicane is placed in crystal vessel b, then will be dry, clear
Clean workpiece to be coated is placed in crystal vessel b, is vacuumized, is passed through protective gas, the gas being then evacuated to again in crystal vessel b
After pressure is less than or equal to 100Pa, closes air inlet, be warming up to 700~1000 DEG C, when heat preservation 0.5-1.5 is small after, with 3-5 DEG C/min
Rate of temperature fall be cooled to less than 100 DEG C, obtain the workpiece with first layer indefinite form coat of silicon carbide；
Step 1 b
Using the workpiece for carrying i-th layer of indefinite form coat of silicon carbide as workpiece to be coated, the operation of step 1 a is repeated, is obtained with i-th
The workpiece of+1 layer of indefinite form coat of silicon carbide；Be further continued for repeat step 1 a until all indefinite form coat of silicon carbide thickness it
With more than or equal to 5 microns；The i is more than or equal to 1.
4. a kind of preparation method of SiC coatings according to claim 3, it is characterised in that：In step 1 a, step 1 b,
When being cooled down with the rate of temperature fall of 3-5 DEG C/min, open air inlet and be passed through nitrogen in crystal vessel b, by the air pressure of crystal vessel b
Control is in 0.101-0.12MPa.
5. a kind of preparation method of SiC coatings according to claim 1-4 any one, it is characterised in that：The poly- first
The average quality of base silane is 800~900, viscosity is 0.02~0.03cps.
6. a kind of preparation method of SiC coatings according to claim 1-4 any one, it is characterised in that：Workpiece to be coated
After being placed in crystal vessel b, do not contacted with liquid polymethyl silicane.
7. a kind of preparation method of SiC coatings according to claim 1-4 any one, it is characterised in that：Poly- methyl silicon
Alkane is prepared by following step；
Step A
Aluminium powder is added in sodium sand, under protective atmosphere, stirring obtains spare sodium sand；The quality of Al and Na in the spare sodium sand
Than for 1:12~1:15；The granularity of the aluminium powder is 30-50um, and the granularity of sodium sand is 0.5-10um；
Step B
By the molar ratio of Na and Si, Na:Si=2.5~1:2~1 with taking spare sodium sand and monomer；Under protective atmosphere, first by sodium
Sand is fitted into reaction kettle, then adds in organic solvent；Stirring, after being warming up to 70-85 DEG C, dividing at least 2 times will drip with the monomer taken
Enter in reaction kettle, stir, carry out back flow reaction；Liquid after being reacted；The monomer is dichloro methyl silane；The organic solvent
One kind in alkane, aromatic hydrocarbon；Organic solvent takes the ratio between volume of monomer as 6 with matching somebody with somebody:1~8:1；
Step C
Under protective atmosphere, centrifugal treating is carried out to liquid after reaction obtained by step 2, centrifugation gained liquid passes through under protective atmosphere
Distillation is handled, and obtains polymethyl silicane.
8. a kind of preparation method of SiC coatings according to claim 1, it is characterised in that：In step 1, workpiece choosing to be coated
One from graphite product, carbon carbon composite product, carbon ceramic composite material product, happy composite product, ceramic
Kind.
9. a kind of preparation method of SiC coatings according to claim 1, it is characterised in that：In step 2, by step 1 institute
The workpiece of indefinite form coat of silicon carbide must be carried；It is placed in sintering furnace, under an argon atmosphere, first with the heating speed of 8-12 DEG C/min
Rate rises to 1000 DEG C by room temperature, then rises to 1500~1600 DEG C with the heating rate of 3-5 DEG C/min, 2-3h is kept the temperature, with furnace cooling
But, the workpiece with beta silicon carbide coating is obtained.
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| CN102674845A (en) * | 2012-05-07 | 2012-09-19 | 中国人民解放军国防科学技术大学 | Preparation method of silicon carbide fibers with silicon nitride surface layer |
| CN105152687A (en) * | 2015-07-13 | 2015-12-16 | 清华大学 | Porous silicon carbide coating layer and production method thereof |
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| CN102674845A (en) * | 2012-05-07 | 2012-09-19 | 中国人民解放军国防科学技术大学 | Preparation method of silicon carbide fibers with silicon nitride surface layer |
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